1.1,3/5，2/5,(),3/13,7/13A.1/5 B.3/10 C5/17,D4/152.1/2,1/6,1/12,1/30,()1/A.1/42 B1/40 C11/42 D1/50

熱心網(wǎng)友

1.最后一個(gè)數(shù)字應(yīng)該是7/37吧.如果是7/37的話,那中間括號(hào)中應(yīng)該是5/17.規(guī)律是分子遞增,分母之差成等差.2/2 3/5 4/10 5/17 6/26 7/37.2.A 1/42 應(yīng)該還有一項(xiàng)1/20分母規(guī)律:1*2=2,2*3=6,3*4=12,4*5=20,5*6=30,6*7=42